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- #
- # script for ATMEL sam4, a Cortex-M4 chip
- #
-
- #
- # sam4 devices can support both JTAG and SWD transports.
- #
- source [find target/swj-dp.tcl]
-
- if { [info exists CHIPNAME] } {
- set _CHIPNAME $CHIPNAME
- } else {
- set _CHIPNAME sam4
- }
-
- if { [info exists ENDIAN] } {
- set _ENDIAN $ENDIAN
- } else {
- set _ENDIAN little
- }
-
- # Work-area is a space in RAM used for flash programming
- # By default use 64kB
- if { [info exists WORKAREASIZE] } {
- set _WORKAREASIZE $WORKAREASIZE
- } else {
- set _WORKAREASIZE 0x4000
- }
-
- #jtag scan chain
- if { [info exists CPUTAPID] } {
- set _CPUTAPID $CPUTAPID
- } else {
- set _CPUTAPID 0x4ba00477
- }
-
- swj_newdap $_CHIPNAME cpu -irlen 4 -ircapture 0x1 -irmask 0xf -expected-id $_CPUTAPID
- dap create $_CHIPNAME.dap -chain-position $_CHIPNAME.cpu
-
- set _TARGETNAME $_CHIPNAME.cpu
- target create $_TARGETNAME cortex_m -endian $_ENDIAN -dap $_CHIPNAME.dap
-
- # 16K is plenty, the smallest chip has this much
- $_TARGETNAME configure -work-area-phys 0x20000000 -work-area-size $_WORKAREASIZE -work-area-backup 0
-
- # JTAG speed should be <= F_CPU/6. F_CPU after reset is 4 MHz, so use F_JTAG = 0.5MHz
- #
- # Since we may be running of an RC oscilator, we crank down the speed a
- # bit more to be on the safe side. Perhaps superstition, but if are
- # running off a crystal, we can run closer to the limit. Note
- # that there can be a pretty wide band where things are more or less stable.
-
- adapter speed 500
-
- adapter srst delay 100
- if {[using_jtag]} {
- jtag_ntrst_delay 100
- }
-
- if {![using_hla]} {
- # if srst is not fitted use SYSRESETREQ to
- # perform a soft reset
- cortex_m reset_config sysresetreq
- }
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